package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    private final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;


/**
     * 微信登录
     * @param userLoginDTO
     * @return*/


    @Override
    public User login(UserLoginDTO userLoginDTO) {
        //访问微信服务获取openid
        Map<String, String> paramMap = new HashMap<>();
        paramMap.put("appid",weChatProperties.getAppid());
        paramMap.put("secret",weChatProperties.getSecret());
        paramMap.put("js_code",userLoginDTO.getCode());
        paramMap.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, paramMap);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");

        //判断openid是否为null,如果为null,抛出异常
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //如果不为null,根据openid,查询用户
        User user = userMapper.getByOpenId(openid);
        //如果为新用户注册
        if (user == null) {
            User newUser = new User();
            newUser.setOpenid(openid);
            newUser.setCreateTime(LocalDateTime.now());
            userMapper.insert(newUser);
        }

        //如果不为新用户直接返回该用户
        return user;
    }
}
